In ‘The World Turned Upside Down’ Christopher Hill studies the beliefs of such radical groups as the Diggers, the Ranters, the Levellers and others, and the social and emotional impulses that gave rise to them. The relations between rich and poor classes, the part played by wandering ‘masterless’ men, the outbursts of sexual freedom, the great imaginative creations of Milton and Bunyan – these and many other elements build up into a marvellously detailed and coherent portrait of this strange, sudden effusion of revolutionary beliefs.